I've never seen a model, but have always intended to do a Chieftain in it. It's called the "Berlin Brigade" scheme, and it looks like one of the most knock-out urban schemes I've ever seen. A Google search for that name should yield some useful pics. (I've picked up a bunch over the years, but can't remember where they all came from.) Here's probably the best link, and an excellent place to start:
http://www.emlra.org/articles/berlin%20brigade.htm
Greg